spectrograph

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spec·tro·graph

(spek'trō-graf),
An instrument used to display or record spectra, as from electromagnetic or sound waves.

spectrograph

(spĕk′trō-grăf) [″ + Gr. graphein, to write]
An instrument designed to photograph spectra on a sensitive photographical plate.

mass spectrograph

A device that separates ions of different masses by employing a magnetic field to deflect them as they travel along a given path.